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Recent Progress to Understand and Improve Zeolite Stability in the Aqueous Medium.

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Title: Recent Progress to Understand and Improve Zeolite Stability in the Aqueous Medium.
Authors: Prodinger, Sebastian1 (AUTHOR) sproding@udel.edu, Derewinski, Miroslaw A.2,3 (AUTHOR) miroslaw.derewinski@pnnl.gov
Source: Petroleum Chemistry. Apr2020, Vol. 60 Issue 4, p420-436. 17p.
Subjects: Zeolite catalysts, Catalyst poisoning, Hot water, Ultrafiltration, Carbonaceous aerosols, Zeolites
Abstract: The work reviewed here attempts to summarize the growing literature on zeolite stability in hot liquid water. This required to first establish the nature, structure and interactions of the active sites in Brønsted and Lewis acidic microporous materials in the presence of liquid water. This understanding was then transferred to zeolite stability and catalyst deactivation. While early results correctly established Si–O–Si hydrolysis as the dominant pathway compared to the Si–O–Al hydrolysis observed in steaming, it also focused extensively on the positive role of framework and extra-framework Al in stabilizing zeolites. However, stability was instead found to more directly correlate with the number of internal structural defects and intraporous water concentration. Stabilization protocols for Brønsted acidic zeolites are described in detail. In the case of Lewis acidic zeolites, their inherent hydrophobic behavior (Si/M >100) makes them more resistant towards water, however, issues such as reversible carbonaceous species formation as well as irreversible metal leaching and fouling remain. Finally, we summarize the most important factors in designing robust and efficient zeolite catalysts made to withstand hot liquid water. [ABSTRACT FROM AUTHOR]
Copyright of Petroleum Chemistry is the property of Springer Nature and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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  Data: Recent Progress to Understand and Improve Zeolite Stability in the Aqueous Medium.
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  Data: <searchLink fieldCode="AR" term="%22Prodinger%2C+Sebastian%22">Prodinger, Sebastian</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> sproding@udel.edu</i><br /><searchLink fieldCode="AR" term="%22Derewinski%2C+Miroslaw+A%2E%22">Derewinski, Miroslaw A.</searchLink><relatesTo>2,3</relatesTo> (AUTHOR)<i> miroslaw.derewinski@pnnl.gov</i>
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  Data: <searchLink fieldCode="JN" term="%22Petroleum+Chemistry%22">Petroleum Chemistry</searchLink>. Apr2020, Vol. 60 Issue 4, p420-436. 17p.
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  Data: <searchLink fieldCode="DE" term="%22Zeolite+catalysts%22">Zeolite catalysts</searchLink><br /><searchLink fieldCode="DE" term="%22Catalyst+poisoning%22">Catalyst poisoning</searchLink><br /><searchLink fieldCode="DE" term="%22Hot+water%22">Hot water</searchLink><br /><searchLink fieldCode="DE" term="%22Ultrafiltration%22">Ultrafiltration</searchLink><br /><searchLink fieldCode="DE" term="%22Carbonaceous+aerosols%22">Carbonaceous aerosols</searchLink><br /><searchLink fieldCode="DE" term="%22Zeolites%22">Zeolites</searchLink>
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  Data: The work reviewed here attempts to summarize the growing literature on zeolite stability in hot liquid water. This required to first establish the nature, structure and interactions of the active sites in Brønsted and Lewis acidic microporous materials in the presence of liquid water. This understanding was then transferred to zeolite stability and catalyst deactivation. While early results correctly established Si–O–Si hydrolysis as the dominant pathway compared to the Si–O–Al hydrolysis observed in steaming, it also focused extensively on the positive role of framework and extra-framework Al in stabilizing zeolites. However, stability was instead found to more directly correlate with the number of internal structural defects and intraporous water concentration. Stabilization protocols for Brønsted acidic zeolites are described in detail. In the case of Lewis acidic zeolites, their inherent hydrophobic behavior (Si/M >100) makes them more resistant towards water, however, issues such as reversible carbonaceous species formation as well as irreversible metal leaching and fouling remain. Finally, we summarize the most important factors in designing robust and efficient zeolite catalysts made to withstand hot liquid water. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
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  Group: Ab
  Data: <i>Copyright of Petroleum Chemistry is the property of Springer Nature and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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        Value: 10.1134/S0965544120040143
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      – Code: eng
        Text: English
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        PageCount: 17
        StartPage: 420
    Subjects:
      – SubjectFull: Zeolite catalysts
        Type: general
      – SubjectFull: Catalyst poisoning
        Type: general
      – SubjectFull: Hot water
        Type: general
      – SubjectFull: Ultrafiltration
        Type: general
      – SubjectFull: Carbonaceous aerosols
        Type: general
      – SubjectFull: Zeolites
        Type: general
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      – TitleFull: Recent Progress to Understand and Improve Zeolite Stability in the Aqueous Medium.
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              Text: Apr2020
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